MXP
From The C&C Wiki
MXP

Details
Reward Type
Points
mXP is allocated 1:1 for doubloons, and is used to determine how much Abstract XP you gain each week. Earned mXP must be claimed onchain from the kap.gg portal to count for Abstract XP. mXP does not directly equal Abstract XP: all Abstract XP calculations and distrubutions are made by the Abstract team and will fluctuate each week depending on chain and app usage.